LibWeb: Add SVG <polygon> element and test case :^)

Userland/Libraries/LibWeb/SVG/SVGPolygonElement.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "SVGPolygonElement.h"
+#include <LibWeb/SVG/AttributeNames.h>
+#include <LibWeb/SVG/AttributeParser.h>
+
+namespace Web::SVG {
+
+SVGPolygonElement::SVGPolygonElement(DOM::Document& document, QualifiedName qualified_name)
+    : SVGGeometryElement(document, qualified_name)
+{
+}
+
+void SVGPolygonElement::parse_attribute(FlyString const& name, String const& value)
+{
+    SVGGeometryElement::parse_attribute(name, value);
+
+    if (name == SVG::AttributeNames::points) {
+        m_points = AttributeParser::parse_points(value);
+        m_path.clear();
+    }
+}
+
+Gfx::Path& SVGPolygonElement::get_path()
+{
+    if (m_path.has_value())
+        return m_path.value();
+
+    Gfx::Path path;
+
+    if (m_points.is_empty()) {
+        m_path = move(path);
+        return m_path.value();
+    }
+
+    // 1. perform an absolute moveto operation to the first coordinate pair in the list of points
+    path.move_to(m_points.first());
+
+    // 2. for each subsequent coordinate pair, perform an absolute lineto operation to that coordinate pair.
+    for (size_t point_index = 1; point_index < m_points.size(); ++point_index)
+        path.line_to(m_points[point_index]);
+
+    // 3. perform a closepath command
+    path.close();
+
+    m_path = move(path);
+    return m_path.value();
+}
+
+}

Userland/Libraries/LibWeb/SVG/SVGPolygonElement.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/SVG/SVGGeometryElement.h>
+
+namespace Web::SVG {
+
+class SVGPolygonElement final : public SVGGeometryElement {
+public:
+    using WrapperType = Bindings::SVGPolygonElementWrapper;
+
+    SVGPolygonElement(DOM::Document&, QualifiedName);
+    virtual ~SVGPolygonElement() override = default;
+
+    virtual void parse_attribute(FlyString const& name, String const& value) override;
+
+    virtual Gfx::Path& get_path() override;
+
+private:
+    Optional<Gfx::Path> m_path;
+
+    Vector<Gfx::FloatPoint> m_points;
+};
+
+}

Userland/Libraries/LibWeb/SVG/SVGPolygonElement.idl

@@ -0,0 +1,5 @@
+[Exposed=Window]
+interface SVGPolygonElement : SVGGeometryElement {
+};
+
+// SVGPolygonElement includes SVGAnimatedPoints;

Userland/Libraries/LibWeb/SVG/TagNames.h

@@ -16,6 +16,7 @@ namespace Web::SVG::TagNames {
     __ENUMERATE_SVG_TAG(g)          \
     __ENUMERATE_SVG_TAG(line)       \
     __ENUMERATE_SVG_TAG(path)       \
+    __ENUMERATE_SVG_TAG(polygon)    \
     __ENUMERATE_SVG_TAG(polyline)   \
     __ENUMERATE_SVG_TAG(rect)       \
     __ENUMERATE_SVG_TAG(svg)